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CN-122000448-A - Composition for forming quasi-solid electrolyte and secondary battery

CN122000448ACN 122000448 ACN122000448 ACN 122000448ACN-122000448-A

Abstract

The composition for forming a quasi-solid electrolyte according to the present invention comprises a liquid electrolyte comprising a lithium salt and an organic solvent, a first monomer having an ionic functional group, a second monomer different from the first monomer and having a crosslinkable functional group, and an initiator. The secondary battery according to the present invention includes a negative electrode, a positive electrode disposed opposite to the negative electrode, and an electrolyte layer disposed between the negative electrode and the positive electrode, and the electrolyte layer contains a cured product of the composition for forming a quasi-solid electrolyte. The positive electrode includes a porous sulfur-containing substrate that includes a plurality of pores, and a cured product of the composition for forming a quasi-solid electrolyte that is included inside the plurality of pores.

Inventors

  • Cui Binna
  • LI XIANGYING
  • Wen Xuanxi

Assignees

  • SK新能源株式会社
  • 延世大学校产学协力团

Dates

Publication Date
20260508
Application Date
20251107
Priority Date
20241107

Claims (15)

  1. 1. A composition for forming a quasi-solid electrolyte, comprising: A liquid electrolyte comprising a lithium salt and an organic solvent; a first monomer having an ionic functional group; a second monomer which is different from the first monomer and has a crosslinkable functional group, and An initiator.
  2. 2. The composition for forming a quasi-solid electrolyte according to claim 1, wherein the first monomer comprises an anionic functional group, a cationic functional group, or both an anionic functional group and a cationic functional group.
  3. 3. The composition for forming a quasi solid electrolyte according to claim 1, wherein the first monomer comprises a nitrogen-based cationic functional group and a sulfur-based anionic functional group.
  4. 4. The composition for forming a quasi-solid electrolyte according to claim 1, wherein the first monomer comprises 3- (triallylammonium) propanesulfonate.
  5. 5. The composition for forming a quasi-solid electrolyte according to claim 1, wherein the content of the first monomer is 0.1 to 5% by weight based on the total weight of the composition for forming a quasi-solid electrolyte.
  6. 6. The composition for forming a quasi-solid electrolyte according to claim 1, wherein the crosslinkable functional group comprises a (meth) acrylate group.
  7. 7. The composition for forming a quasi-solid electrolyte according to claim 1, wherein the second monomer comprises at least one selected from the group consisting of ethoxylated bisphenol a di (meth) acrylate, ethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, ethoxylated trimethylolpropane tri (meth) acrylate, (meth) acrylic acid, carboxyethyl di (meth) acrylate, cyano (meth) acrylic acid, propylene glycol di (meth) acrylate, polyurethane di (meth) acrylate, neopentyl glycol di (meth) acrylate, isobornyl di (meth) acrylate, isophorone di (meth) acrylate, hexamethylene di (meth) acrylate, phenyl glycidyl ether di (meth) acrylate, and tetraethylene glycol di (meth) acrylate.
  8. 8. The composition for forming a quasi-solid electrolyte according to claim 1, wherein the content of the second monomer is 5 to 20% by weight based on the total weight of the composition for forming a quasi-solid electrolyte.
  9. 9. The composition for forming a quasi-solid electrolyte according to claim 1, wherein a ratio of a weight of the second monomer to a weight of the first monomer is 1 to 10 in a total weight of the composition for forming a quasi-solid electrolyte.
  10. 10. The composition for forming a quasi-solid electrolyte according to claim 1, wherein the initiator comprises a thermal initiator or a photoinitiator.
  11. 11. The composition for forming a quasi-solid electrolyte according to claim 1, wherein the content of the initiator is 0.1 to 10 parts by weight with respect to 100 parts by weight of the total weight of the first monomer and the second monomer.
  12. 12. The composition for forming a quasi solid electrolyte according to claim 1, wherein the lithium salt comprises a first lithium salt containing an organic anion and a second lithium salt containing an inorganic anion.
  13. 13. The composition for forming a quasi solid electrolyte according to claim 1, wherein the organic solvent comprises a cyclic ether-based solvent and a linear ether-based solvent.
  14. 14. A secondary battery, comprising: A negative electrode; a positive electrode disposed opposite to the negative electrode, and An electrolyte layer provided between the negative electrode and the positive electrode, the electrolyte layer containing a cured product of a composition for forming a quasi-solid electrolyte, Wherein, the positive electrode includes: A porous sulfur-containing matrix comprising a plurality of pores, and A cured product of the composition for forming a quasi-solid electrolyte, the cured product of the composition for forming a quasi-solid electrolyte being contained inside the plurality of pores, Wherein the composition for forming a quasi-solid electrolyte comprises: A liquid electrolyte comprising a lithium salt and an organic solvent; a first monomer having an ionic functional group; a second monomer which is different from the first monomer and has a crosslinkable functional group, and An initiator.
  15. 15. The secondary battery according to claim 14, wherein the cured product of the composition for forming a quasi-solid electrolyte contains a copolymer of the first monomer and the second monomer.

Description

Composition for forming quasi-solid electrolyte and secondary battery Technical Field The invention provides a composition for forming a quasi-solid electrolyte and a secondary battery. Background Secondary batteries are rechargeable and dischargeable batteries, and with the development of information communication and display industries, secondary batteries are widely used as power sources for portable electronic communication devices such as camcorders, cellular phones, notebook computers (PCs), and the like. In addition, in recent years, a battery pack including a secondary battery is being developed and used as a power source for an environment-friendly vehicle such as a hybrid vehicle. Examples of the secondary battery include lithium secondary batteries, nickel cadmium batteries, nickel hydrogen batteries, lithium sulfur batteries, and the like. Since a liquid electrolyte is mainly used for a secondary battery which is commercialized at present, there are safety problems such as leakage, ignition, explosion, etc. according to abrupt environmental changes such as temperature changes and external impacts. In order to solve these problems, attempts have been made to solidify the electrolyte to ensure stability and to improve energy density. All-Solid-State (All-Solid-State) batteries may contain Solid electrolytes such as gel polymers, oxides or sulfides, composite polymers, and the like as electrolytes. Therefore, stability against fire and explosion caused by external impact, external environmental change, or the like can be improved. Disclosure of Invention First, the technical problem to be solved It is an object of the present invention to provide a composition for forming a quasi-solid electrolyte which can provide a quasi-solid electrolyte having improved electrochemical physical properties. An object of the present invention is to provide a secondary battery comprising a cured product of the composition for forming a quasi-solid electrolyte. (II) technical scheme The composition for forming a quasi-solid electrolyte according to the present invention comprises a liquid electrolyte comprising a lithium salt and an organic solvent, a first monomer having an ionic functional group, a second monomer different from the first monomer and having a crosslinkable functional group, and an initiator. In exemplary embodiments, the first monomer may include an anionic functional group, a cationic functional group, or both an anionic functional group and a cationic functional group. In an exemplary embodiment, the first monomer may include a nitrogen-based cationic functional group and a sulfur-based anionic functional group. In an exemplary embodiment, the first monomer may include 3- (triallylammonium) propanesulfonate. In an exemplary embodiment, the first monomer may be contained in an amount of 0.1 to 5 wt% based on the total weight of the composition for forming a quasi-solid electrolyte. In exemplary embodiments, the crosslinkable functional group may include a (meth) acrylate group. In an exemplary embodiment, the second monomer may include at least one selected from the group consisting of ethoxylated bisphenol a di (meth) acrylate, ethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, ethoxylated trimethylolpropane tri (meth) acrylate, (meth) acrylic acid, carboxyethyl di (meth) acrylate, cyano (meth) acrylic acid, propylene glycol di (meth) acrylate, polyurethane di (meth) acrylate, neopentyl glycol di (meth) acrylate, isobornyl di (meth) acrylate, isophorone di (meth) acrylate, hexamethylene di (meth) acrylate, phenyl glycidyl ether di (meth) acrylate, and tetraethylene glycol di (meth) acrylate. In an exemplary embodiment, the second monomer may be contained in an amount of 5 to 20wt% based on the total weight of the composition for forming a quasi-solid electrolyte. In an exemplary embodiment, the ratio of the weight of the second monomer to the weight of the first monomer may be 1 to 10 in the total weight of the composition for forming a quasi-solid electrolyte. In exemplary embodiments, the initiator may comprise a thermal initiator or a photoinitiator. In an exemplary embodiment, the initiator may be contained in an amount of 0.1 to 10 parts by weight with respect to 100 parts by weight of the total weight of the first and second monomers. In an exemplary embodiment, the lithium salt may include a first lithium salt including an organic anion and a second lithium salt including an inorganic anion. In exemplary embodiments, the organic solvent may include a cyclic ether-based solvent and a linear ether-based solvent. The secondary battery according to the present invention includes a negative electrode, a positive electrode disposed opposite to the negative electrode, and an electrolyte layer disposed between the negative electrode and the positive electrode, and containing a solidified product of a composition for forming a quasi-solid electrolyte. The positive electrode